I don't know that they'd be that effective. We had to watch a couple of these for one of my classes this semester before we were eligible to use any of the equipment in the shop. They were pretty gory- it was like watching dawn of the dead at 8 in the morning. Most of my classmates thought the videos were pretty funny, i thought that they were kind of gross- i've always been a bit squeamish when it comes to entertainment.
I don't imagine they were that effective, but that's not really something i have any evidence for. As far as i know, no one got stuck in the rolling machine this semester. That being said, i don't think that carelessness, which is the cause of a lot of accidents like these, is something you can fix with a video.
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